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(NoModel.) I

W. P. GARRISON.

VALVE POR PUMPS. No. 247,901. A 'Patented 001;. 4, v1881.

l v n n 1 a l y w f v y UNITED STATES PATENT OFFICE.

WILLIAM F. GARRISON, OF BROOKLYN, NFV YORK, ASSIGNOR 'IO GUILD @t GARRISON, OF SAME PLACE.

f VALVE FOR PUMPS.

y SPECIFICATION forming part of Letters latent No. 247,901, dated October 4, 1881. Application tiled June 8, 1881. (No model.) Patented in England September 18, 18,78.

To clldwhom it may concern:

Be it known that I, WILLiAM F. GARRrsoN, of the city ofBrooklyn, in the county ot' Kings and State of New York, have invented certain new and useful Improvements in Valves for ceiving the annular enlargement ot' said valve,

the annular enlargements ot' the valve and valveseat together forming a dash-pot for arresting the movement of the valve in closing, as hereinafter described.

The invention also consists in the combination, in a pump, ot' two single-acting cylinders arranged in line, two connected pistons working therein, inlet'or suction valves of the kind above described fitted in said'pistons,aud a voke or connection between said valves. The dash-pot formed by each valve-seat and valve then serves to cushion both valves in their simultaneous movements.

The invention also consists in a novelmeans of supporting the weights of the two valves and yoke or connection between them, so as to prevent side wear of the valves and seats.

In the accompanying drawings, Figure 1 represents a central longitudinal section of a compressor embodying my invention. Fig. 2 represents a transverse section of the yoke or connection on the dotted line w, Fig. 1, and a View ofthe outer end of the inlet-valve and Fig. 3 represents a section otl a piston and inlet-valve i'or a compressor having' only one single-acting cylinder and piston.

Similar letters of reference designate corresponding parts in both gures.

A designates two sin gie cylinders closed only at their outer ends and connected together or to a common frame or bed in any suitable manner. Each cylinder is provided at its outer end with' an outlet or discharge valve, B.

G designates two pistons fitting in the cylinders A, provided with any suitable packing and connected by a, trunk, C', so as to work simultaneously, one making its working stroke While the other is making its return-stroke. In the trunk C is a cross-head, a, to which rods or other devices may be connected for working the pistons by means ot" asteam-engine or other means for producing motive power.

D designates inlet or suction valves, shown 6o as of cylindric form, which are closed at their outer ends, and are connected by a yoke or connection, D', which is constructed so as to embrace the cross-head a, and causes the valves D to work simultaneously, one closing as the other is opening.

The valves 1) work in seats Eof cylindric forni in the pistons C, and near the closed outer end of each valve is au annular series or line of holes, b, which are closed by being covered 7o by the valve-seat E, when one or the other of the valves is moved inward relatively to the piston containing it.

In Fig.' 1 the valve D otl the left-hand piston C has its holes b covered by the seat, and is therefore closed, while the valve of the right-hand piston has its holes un covered by the seat, and is therefore open. In the drawings the pistons are represented as just about commencing their stroke toward the right and the pressure generated in the air con- 8o tained in the ri ght-hand cylinder, and the suction in the left-hand cylinder produced by the .movement of the pistons toward the right will cause the two valves D to be shifted toward the left, closing the valve ot' the right-band S5 piston and opening the valve ot' the left-hand piston.

The weight ot' the two valves D, and more especially the weight ofthe yoke or connection D', would produce side wear ot' the valves and 9o their seats E, and to prevent this I form a socket, c, in the upper side of the yoke D', in which is fitted a saddle or plunger, d, which is impelled downward by a spring, e, and lean upon a seat,f, on the upper side of the crosshead c. r1`he weight of the valves and yoke or connection is then, through the springe, supported on the seat f. At the end of each valveseat E, in the inner side ot' each piston C, is formed an annular enlargement or recess, E', too

and each valve D has a corresponding annular enlargement or projection, D2, at its inner end, which tits snugly in the enlargement or recess E. In each enlargement or recess E is a port or passage, g, leading from the atmosphere. The enlargementor recess 4" and the enlargementor projection D2 on thevalve form a dashpot for cushioning the movement ofthe valve and preventing any shock from the opening or closing ofthe valve. The dash being formed upon or integral with the valve itself and the dash-pot formed in the same piece or integral with the seat, the desired end is attained without additional parts and almost without ex* pense, as the costot construction is only very slightly increased. Where the two valves are connected as here shown the dash-pot of each valve serves to cushion both valves, one being cushioned in opening and the other in closing.

The valve represented in Fig. 3 is intended for a single-acting single-cylinder compressor.

C designates the piston, and E the valveseat, which in this case is formed by inserting a brass bush in the piston, and has the annular enlargementor recess E intermediate between its ends instead of at one end, as in Fig. 1. The valve D3 in this instance has its enlargement or annular projection D2 between its ends, as clearly shown, and thus I form a double dashpot which will cushion the valve both in opel ing and closing.

I am aware thata dash-pot has been made in which a plunger having an annular enlargement is titted in a cylinder having a corre sponding annular enlargement, the upward movement ot' the plunger being resisted by the vacuum formed below it in its ascent, and the downward movement of the plunger being resisted by air which is trapped in the annular enlargementof the cylinder. This device,how ever, has no function beyond that ot' a dashpot. It does not form a valve, and its plunger -is adapted to be connected with a valve by a rod or other connection, whereby the movements ot' the valve are imparted to the plunger and the valve thereby cushioned.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination, in a pump, ot' a cylindric valve for controlling the passage of air or other tlnid to or from the same, and having an annular enlargement formed integral with it, and a cylindric valve'seat in which said valve fits, and which has an annular enlargement formed integral with it and receiving the annular enlargement of said valve, the annular enlargements of the valve and valveseat together forming a daslrpot for arresting the movementof the valve in closing, substantially as specified.

2. The combination,in a pump,0t' two singleacting cylinders and two connected pistons, cach having in it a valve-seat and an enlarge ment or recess therein, two valves fitting said seats, and each having an annular enlargement or projection fitting the enlargement or recess in its seat, and a yoke or connectionbetween said valves, for causing them to work simultaneously, and enabling the dash-pot of each valve to cushion both valves, substantially as specified.

3. rIhe combination of the cylinders A, the connected pistons C, the valves D, the yoke D', connecting said valves, the trunk C', andthe spring-actuated saddle d, bearing on said trunk, for supporting the weight ot' said valves, substantially as specited.

WILLIAM F. GARRISON.

Witnesses FREDK. HAYNES, HENRY T. BROWN. 

